The amazilia hummingbird (Amazilis amazilia) is a hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is the only species placed in the genus Amazilis. It is found in Ecuador and Peru. Its six subspecies differ primarily in their throat and belly colors. Taxonomy An illustration of the amazilia hummingbird together with the binomial name Orthorynchus amazilia was published in 1827 by the French naturalist René Lesson. In the following year he published a description. The specific epithet is from the name of the Inca heroine in Jean-François Marmontel's novel Les Incas, ou la destruction de l'Empire du Pérou. The amazilia hummingbird was formerly placed in the genus Amazilia. A molecular phylogenetic study published in 2014 found that the genus was polyphyletic. In the revised classification to create monophyletic genera, the amazilia hummingbird was moved by most taxonomic authorities to the resurrected genus Amazilis that had been introduced in 1855 by George Gray. However, BirdLife International's Handbook of the Birds of the World retains it in Amazilia. There are six generally recognized subspecies: A. a. alticola (Gould, 1860) – south Ecuador A. a. azuay (Krabbe & Ridgely, 2010) – southwest Ecuador A. a. dumerilii (Lesson, RP, 1832) – west Ecuador and northwest Peru A. a. leucophoea (Reichenbach, 1854) – northwest Peru A. a. amazilia (Lesson & Garnot, 1827) – west Peru A. a. caeruleigularis (Carriker, 1933) – southwest Peru Some ornithologists have proposed that subspecies A. a. alticola should be treated as a separate species, the "Loja hummingbird". Description The amazilia hummingbird is long. Males weigh and females . Both sexes of all subspecies have a straight, medium length, pinkish-red bill with a black tip. Adult males of the nominate subspecies A. a. amazilia have golden-green upperparts with rufous uppertail coverts. Their tail is also mostly rufous, with some bronze-green on the outer feathers. They have a glittering golden- to turquoise-green throat and a rufous lower breast and belly. Adult females have almost the same plumage, with the addition of some white on the chin and throat and a paler rufous belly. Juveniles resemble adult females with the addition of browish edges on their upperparts' feathers. The amazilia hummingbird's song is "a variable but typically descending series of 4–10 squeaky notes, repeated at intervals." There are differences within and among the subspecies, especially that of A. a. alticola compared to the others. The species makes calls described as "tsip"